Exploring CP-violation, via heavy neutrino oscillations, in rare B meson decays at Belle II

In this article we study the rare B-meson decay via two on-shell almost-degenerate Majorana Heavy Neutrinos, into two charged leptons and two pseudoscalar mesons ($B^{pm} to D^0 ell^{pm}_1 ell^{pm}_2 pi^{mp}$). We consider the scenario where the heavy neutrino masses are $sim 2$ GeV and the heavy-light mixing coefficients are $|B_{ell N}|^2 sim 10^{-5}$, and evaluate the possibility to measure the CP-asymmetry at Belle II. We present some realistic conditions under which the asymmetry could be detected.